Warning: following the coronavirus emergency, all the talks will be given remotely online. The link to connect to the seminar will be available in due time. A playlist of the remote talks already online is available on our YouTube channel »
Diffuse radio emission from galaxy clusters in LoTSS-DR2
Andrea Botteon (Leiden Observatory)
Tuesday 28/09/2021 @ 14:00, Sala IV piano Battiferro
The LOFAR Two-meter Sky Survey (LoTSS) is an on-going survey aimed at imaging the entire northern sky at 120-168 MHz with unprecedented resolution and sensitivity in this frequency range. It had its first data release in 2019 and a new, second data release is forthcoming. LoTSS-DR2 will comprise images for 5700 square degrees of the northern sky, where more than 4 million radio sources have been detected. One of the main goals of this survey is to study diffuse synchrotron sources in galaxy clusters, such as radio halos, mini-halos, and relics. In this talk, I will present the results from the analysis of all the 309 galaxy clusters detected by the Planck satellite that reside in the LoTSS-DR2 area. I will discuss the challenges faced during the analysis of this large sample and summarize the properties of the sources observed, showing how LoTSS observations are allowing us to expand the parameter space of galaxy cluster studies. This project represents the largest search for diffuse synchrotron sources in the intra-cluster medium performed to date and the first statistical study dealing with hundreds of clusters covered by deep low-frequency radio observations.